Which statement about Aspergillus is true in this context?

• A. It causes Aspergillosis
• B. It is a bacterium
• C. It is a yeast
• D. It does not cause disease

Answer: (A)

Aspergillus is a mold, a filamentous fungus that can cause disease in humans. In this context, the statement that it causes aspergillosis is true. It isn’t a bacterium, so it’s not a simple prokaryote, and it isn’t a yeast, which are unicellular fungi. Instead, Aspergillus forms hyphae and produces spores, and certain species (notably Aspergillus fumigatus) are well known opportunistic pathogens that can lead to a range of illnesses—from allergic reactions (like ABPA) to colonization with a fungus ball (aspergilloma) and invasive, potentially disseminated disease in immunocompromised individuals.